i need help with thijs question

Acme Corp. signed a contract to sell inventory to a customer on January 1, 2020. The amount the customer will pay for each item purchased depends on how many items the customer eventually buys over the two-year contract period, as listed below along with Acme's assessment of the likelihoods the customer will end up buying different amounts. During the first quarter of 2020, the customer ordered and Acme delivered 10 items. How much revenue should Acme recognize for the sale of these 10 items? # Items Purchased Price Per Item Probability Up to 100 $10 30% 101 to 500 $9 40% 501 to 1,000 $8 20% Over 1,000 $7 10%